/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership.  The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with the License.  You may obtain
 * a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package org.apache.zookeeper.graph.servlets;

import java.io.File;
import java.io.IOException;
import java.io.FileNotFoundException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

import java.util.regex.Pattern;
import java.util.regex.Matcher;

import org.apache.zookeeper.graph.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class NumEvents extends JsonServlet {
    private static final Logger LOG = LoggerFactory.getLogger(NumEvents.class);
    private static final int DEFAULT_PERIOD = 1000;

    private LogSource source = null;

    public NumEvents(LogSource src) throws Exception {
        this.source = src;
    }

    String handleRequest(JsonRequest request) throws Exception {
        String output = "";

        long starttime = 0;
        long endtime = 0;
        long period = 0;

        starttime = request.getNumber("start", 0);
        endtime = request.getNumber("end", 0);
        period = request.getNumber("period", 0);

        if (starttime == 0) {
            starttime = source.getStartTime();
        }
        if (endtime == 0) {
            if (period > 0) {
                endtime = starttime + period;
            } else {
                endtime = source.getEndTime();
            }
        }

        LogIterator iter = source.iterator(starttime, endtime);
        JSONObject data = new JSONObject();
        data.put("startTime", starttime);
        data.put("endTime", endtime);
        long size = 0;

        size = iter.size();

        data.put("numEntries", size);
        if (LOG.isDebugEnabled()) {
            LOG.debug("handle(start= " + starttime + ", end=" + endtime + ", numEntries=" + size + ")");
        }
        iter.close();
        return JSONValue.toJSONString(data);
    }
}

